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Issue 15, 2018
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Amide versus amine ligand paradigm in the direct amination of alcohols with Ru-PNP complexes

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Abstract

The catalytic activity of a series of Ru-PNP pincer ligand complexes was studied in the direct amination of alcohols with ammonia. It turned out that all complexes of PNP ligands bearing a secondary amine showed no activity in this hydrogen-shuttling reaction sequence, while all complexes of homologous ligands bearing a tertiary amine gave active catalysts. Further comparative studies on catalysts bearing an acridine-based PNP pincer ligand and a PNP ligand of the Xantphos family provided valuable mechanistic insight that led to the design of a highly active catalyst. It appears that in the group of ligands studied here only ligands that do not form stable Ru-amido complexes are active alcohol amination catalysts.

Graphical abstract: Amide versus amine ligand paradigm in the direct amination of alcohols with Ru-PNP complexes

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Supplementary files

Article information


Submitted
29 Apr 2018
Accepted
10 Jul 2018
First published
18 Jul 2018

Catal. Sci. Technol., 2018,8, 3969-3976
Article type
Paper

Amide versus amine ligand paradigm in the direct amination of alcohols with Ru-PNP complexes

D. Pingen, J. Choi, H. Allen, G. Murray, P. Ganji, P. W. N. M. van Leeuwen, M. H. G. Prechtl and D. Vogt, Catal. Sci. Technol., 2018, 8, 3969
DOI: 10.1039/C8CY00869H

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